Hat geantwortet auf: Question mark on start up?The lock with a password prompt means that the machine is firmware locked. What that means is someone loaded the firmware utility and added a password. If you do not know what the password is you will have to go to an apple store with the receipt from when you purchased it so they can remove the lock. Also it will take about 48 hours to have this done. They can also scan the hardware of the computer to see if the folder with a question mark is due to a faulty hard drive, or just needs a reinstall.